notfication guide text + check for empty LNO var

comp-backup-install.sh

@@ -598,7 +598,11 @@ logupdate(){
         MSG="with SUCCESS"
     fi
     LNO=\$( grep -n 'INFO' \$LOG-last | tail -1 | cut -d":" -f1 )
+    if [ -z \$LNO ]; then
+        echo "Error when running the backup script"
+    else
         sed -n "\$LNO,\\\$p" \$LOG-last >> \$LOG-short
+    fi
     echo -e "#### BACKUP END: \$(date +%Y-%m-%d\ %H:%M:%S) \$MSG" >> \$LOG-short
     cat \$LOG-last >> \$LOG
     rm -f \$LOG-last
@@ -710,6 +714,8 @@ if [ $HOST_OS = 'Darwin' ]; then
     echo -e "#
 # Please click the 'Play' button in the header bar above to trigger a notification
 #
+# If the pop-up does NOT say: 'It is working!' follow the next steps
+#
 # Click the 'Script Editor' notifications pop-up to open the Notification Settings window
 #
 # Enable 'Allow notifications'
@@ -719,7 +725,7 @@ if [ $HOST_OS = 'Darwin' ]; then
 # Close the Script Editor and continue with the backup install script
 # \n
 " > /tmp/notification.applescript
-    echo 'display notification "Notifications from scripts are working!"' >> /tmp/notification.applescript
+    echo 'display notification "It is working!"' >> /tmp/notification.applescript
     open -a 'Script Editor' /tmp/notification.applescript
 
     sleep 5